Cancelei minha assinatura no AI mas mesmo assim fui cobrado

For refund rules, refer to the following link.
https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html

Please do verify that the subscription was indeed cancelled properly, did you get a confirmation email? If you have any doubts contact support, since refund is a time sensitive thing it's better you clear this out as soon as possible. To contact support, login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
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-Manan
-Manan